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Re: [MMUSIC] DTLS-over-SCTP, anyone?

Roman Shpount <roman@telurix.com> Mon, 08 February 2016 16:29 UTC

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Date: Mon, 08 Feb 2016 11:29:51 -0500
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From: Roman Shpount <roman@telurix.com>
To: "Schwarz, Albrecht (Nokia - DE)" <albrecht.schwarz@nokia.com>
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Cc: mmusic <mmusic@ietf.org>, EXT Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] DTLS-over-SCTP, anyone?
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Albrecht,

The problem with DTLS-over-SCTP (RFC 6083) is that it is not fully
compatible with draft-ietf-mmusic-dtls-sdp. In particular, RFC 6083 does
not allow DTLS association span across multiple SCTP associations,
but draft-ietf-mmusic-dtls-sdp allows to preserve DTLS association through
a transport change. The most likely solution to this is updating RFC 6083,
but, if no one is using DTLS-over-SCTP, it would be easier just to say
that DTLS-over-SCTP is not supported.

Regards,

_____________
Roman Shpount

On Mon, Feb 8, 2016 at 10:12 AM, Schwarz, Albrecht (Nokia - DE) <
albrecht.schwarz@nokia.com> wrote:

> Hello Christer,
>
>
>
> the titel of the (future) RFC will not exclude any SCTP transport modes.
>
> And a comprehensive and future safe protocol specification should cover
> all existing ones, which is “DTLS/SCTP/IP” as well as “SCTP/UDP/IP” (RFC
> 6951).
>
> These two SCTP transport modes should be indicated as well, independent of
> potential intentions to be used soon.
>
> Codepoint space could be reserved, placeholder sections tagged as “not yet
> supported” of “for further studies”, etc, but the worst case would be any
> kind of interaction issues in future.
>
>
>
> My view,
>
> Albrecht
>
>
>
>
>
> *From:* mmusic [mailto:mmusic-bounces@ietf.org] *On Behalf Of *EXT
> Christer Holmberg
> *Sent:* Montag, 8. Februar 2016 15:33
> *To:* mmusic <mmusic@ietf.org>
> *Subject:* [MMUSIC] DTLS-over-SCTP, anyone?
>
>
>
> Hi,
>
>
>
> draft-ietf-mmusic-sctp-sdp currently defines the SDP O/A procedures for
> SCTP, SCTP-over-DTLS, and DTLS-over-SCTP.
>
>
>
> As we know, SCTP-over-DTLS is used for the WebRTC data channel.
>
>
>
> My question is: does anyone intend to use DTLS-over-SCTP?
>
>
>
> Regards,
>
>
>
> Christer
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>
>

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